| Oval (geometry) |
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Two examples of ovals are shown below. In (''a''), a Semicircle is joined to half an ellipse while in (''b''), two semicircles are connected with straight Line Segment s. Other ''ad hoc'' constructions are often encountered as well. This second oval shape is called a segmircle. The term "segmircle" applies to all ovals formed by joining two semicircles, both with diameter d, and two parallel line segments d units apart, no matter how elongated the resulting shape is. Just as circulation refers to motion in a circular path, segmirculation is motion in a segmircular path. Many objects have segmircular shapes or cross-sections. Suitcases in the baggage claim area of an airport often segmirculate until their owners pick them up.
Other examples of ovals described elsewhere include: EGG SHAPE The shape of an egg is approximately an oblate Ellipsoid , but, while keeping cylindrical symmetry, as illustrated above, there is not quite symmetry in a plane perpendicular to the long axis. The term ''egg-shaped'' is typically used taking this asymmetry into account, but it may also simply mean oblate ellipsoid. It can also be used for a 2D shape. PROJECTIVE PLANES In the theory of Projective Plane s, ''oval'' is used to mean a set of ''q'' + 1 non- Collinear points in PG(2,q), the projective plane over the Finite Field with ''q'' elements. See Oval (projective Plane) . |
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